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3 7/8" Roatry Tricone Drill Bit /TCI Tricone Rock Drill Bit for Water Well Drilling and Oil Mining, Find Details and Price about Diamond Drill Bit Diamond Core Drill Bit from 3 7/8" Roatry Tricone Drill Bit /TCI Tricone Rock Drill Bit for Water Well Drilling and Oil Mining - Changde Hailian Imp & Exp Co., Ltd.